Journal
JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS
Volume 191, Issue -, Pages 170-182Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jweia.2019.06.006
Keywords
IDDES; Simplification; Bogie; Train; Aerodynamics; Underbody flow
Categories
Funding
- Key Laboratory of Traffic Safety on Tracks of Ministry of Education
- National key R & D program of China [2016YFB1200506-03, 2016YFB1200403-C-02, 2016YBF1200402]
- National Railway Administration of China [KF2017-006]
- Open Foundation Subject of China Academy of Railway Sciences [2017YJ164]
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In this study, the numerical solution of a high-speed train with several simplified bogies is investigated. The timeaveraged flow field around the train, the surface pressure, and the aerodynamic forces on the train are discussed. The results reveal that a simpler bogie structure can achieve a higher underbody flow velocity and change fluctuations beneath the train owing to the resulting turbulence level. The simplification of bogies has a smaller effect on the side slipstream velocity and pressure compare to which in underbody, and at 3m away from the centre of the track, the simplified bogie with wheels and a simple side frame used in this study obtains similar results to cases wherein more complex bogies are used. The surface pressure under the train is affected by bogie simplification, especially in the bogie cabin end area, resulting in aerodynamic drag and lift variations. If underbody flow or aerodynamic drag and lift forces are the focus of study, then the geometry of the centre region of the bogie, i. e. its main structures features, should be maintained in simplified models.
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